General: |
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Name: Technetium
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Symbol: Tc
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Group: Trans. Met.
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Atomic weight: 98.9062
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Density @ 293 K: 11.5 g/cm3
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Atomic volume: 8.5 cm3/mol
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Group: Trans. Met.
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discovered: 1939
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States: |
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state (s, l, g): s
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melting point: 2445.2 K
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boiling point: 4840 K
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Heat of fusion: 24.0 kJ/mol
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Heat of vaporization: 660.0 kJ/mol
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Energies: |
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1st ionization energy: 702.4 kJ/mole
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electronegativity: 1.9
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2nd ionization energy: 1472.4 kJ/mole
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electron affinity: 53 kJ/mole
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3rd ionization energy: 2850.2 kJ/mole
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Specific heat: 0.21 J/gK
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heat atomization: 677 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,14,1
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electron configuration: [Kr] 4d5 5s2
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minimum oxidation number: -3
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maximum oxidation number: 7
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min. common oxidation no.: 0
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max. common oxidation no.: 7
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Appearance & Characteristics: |
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structure: hcp: hexagonal close pkd
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color: silvery gray
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uses: medical imaging agents
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toxicity:
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hardness: mohs
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characteristics: Radioactive, man made
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Reactions: |
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reaction with air: mild, w/ht, =>Tc2O7
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reaction with 6M HCl: none
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reaction with 6M HCl: none
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reaction with 15M HNO3: mild, =>HTcO4
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reaction with 6M NaOH:
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Other Forms: |
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number of isotopes: 0
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hydride(s): none
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oxide(s): TcO2 Tc2O7
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chloride(s): TcCl4
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Radius: |
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ionic radius (2- ion): pm
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ionic radius (1- ion): pm
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atomic radius: 136 pm
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ionic radius (1+ ion): pm
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ionic radius (2+ ion): pm
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ionic radius (3+ ion): pm
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Conductivity: |
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thermal conductivity: 50.6 J/m-sec-deg
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electrical conductivity: 1/mohm-cm
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polarizability: 11.4 A^3
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Abundance: |
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source: Synthetic (U fission)
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rel. abund. solar system: log
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abundance earth's crust: log
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cost, pure: $/100g
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cost, bulk: $/100g
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